CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 15,967	$ (26,175)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	16,450	22,425
Impairment of acquired intangible assets	0	11,900
Amortization of operating lease right-of-use assets	2,907	0
Loss on re-financing of long-term debt	2,235	0
Amortization of debt issuance costs and discount	1,215	1,058
Stock-based compensation expense	7,655	7,200
Impairment of operating lease right-of-use asset (recorded in Restructuring charges)	977	0
Other non-cash adjustments	(39)	(130)
Changes in assets and liabilities:
Accounts receivable, net	22,997	(19,654)
Inventories	2,132	14,687
Prepaid expenses and other assets	(5,097)	(7,891)
Accounts payable and accrued expenses (includes restructuring)	3,974	7,095
Accrued payroll obligations	(309)	(1,716)
Operating lease liabilities, current and long-term portions	(3,975)	0
Income taxes payable	(593)	851
Deferred licensing and services revenue	0	(68)
Net cash provided by operating activities	66,496	9,582
Cash flows from investing activities:
Proceeds from sales of and maturities of short-term marketable securities	9,655	2,500
Purchases of marketable securities	0	(9,603)
Capital expenditures	(8,459)	(4,105)
Cash paid for software licenses	(3,597)	(3,981)
Net cash used in investing activities	(2,401)	(15,189)
Cash flows from financing activities:
Restricted stock unit tax withholdings	(1,014)	(1,369)
Proceeds from issuance of common stock	14,037	6,409
Proceeds from issuance of long-term debt	206,500	0
Original issue discount and debt issuance costs	(2,086)	0
Repayment of debt	(278,033)	(12,009)
Net cash used in financing activities	(60,596)	(6,969)
Effect of exchange rate change on cash	86	(540)
Net increase (decrease) in cash and cash equivalents	3,585	(13,116)
Beginning cash and cash equivalents	119,051	106,815
Ending cash and cash equivalents	122,636	93,699
Supplemental cash flow information:
Interest paid	8,103	9,177
Operating lease payments	4,613	0
Income taxes paid, net of refunds	1,500	2,057
Accrued purchases of plant and equipment	1,627	354
Operating lease right-of-use assets obtained in exchange for lease obligations	298	0
Change in unrealized gain related to marketable securities, net of tax, included in Accumulated other comprehensive loss	$ 42	$ 2